Assessment of Bone Quality After Socket Preservation Using Sodium Alendronate Gel Compared to Sticky Bone

Inclusion Criteria: \- defective class III sockets * Patients with non-restorable teeth extracted sites * Patients who have given their consent for this trial. * Both genders males and females will be included. Exclusion Criteria: * Patients should not have taken drugs, especially bisphosphonates or drugs altering bone metabolism, within 2 months before the inclusion in the study. * Subjected to irradiation in the head and neck area less than 1 year before implantation. * Patients having history of allergy to any drugs. * Patients who have a history of any concomitant major known medical problem and/or ongoing pharmacologic treatments * Untreated periodontitis. * Poor oral hygiene and motivation. * Uncontrolled diabetes. * Pregnant or nursing. * Substance abuse. * Psychiatric problems or unrealistic expectations. * Severe bruxism or clenching. * Immunosuppressed or immunocompromised. * Treated or under treatment with intravenous amino-bisphosphonates. * Active infection or severe inflammation in the area intended for implant placement. * Unable to open mouth sufficiently to accommodate the surgical tooling. * Patients participating in other studies, if the present protocol could not be properly followed. * Referred only for implant placement or unable to attend a 5-year follow-up.